/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraEvents.h
Type struct for collision event payloads; collision event data set is based on this TODO: figure out how we can pipe attributes from the colliding particle in here
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FNiagaraCollisionEventPayload
FVector
CollisionNormal
Forward declaration of concrete types // Macro version - declares all three variants.
FVector
CollisionPos
FVector
CollisionVelocity
Forward declaration of concrete types // Macro version - declares all three variants.
int32
ParticleIndex
int32
PhysicalMaterialIndex